Re: Casts on lvalues

Path	csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!cs.uu.nl!news.stack.nl!.POSTED!not-for-mail
From	Willem <willem@turtle.stack.nl>
Newsgroups	comp.lang.c
Subject	Re: Casts on lvalues
Date	Wed, 5 Dec 2012 22:36:50 +0000 (UTC)
Organization	Stack Usenet News Service
Lines	28
Message-ID	<slrnkbvj42.jen.willem@turtle.stack.nl> (permalink)
References	<xDIus.482873$GX.378393@fx01.am4> <lny5hg8a7r.fsf@nuthaus.mib.org> <4BPus.800532$EF4.173275@fx23.am4>
NNTP-Posting-Host	turtle.stack.nl
Mime-Version	1.0
Content-Type	text/plain; charset=us-ascii
Content-Transfer-Encoding	7bit
X-Trace	mud.stack.nl 1354747010 13356 2001:610:1108:5010::132 (5 Dec 2012 22:36:50 GMT)
X-Complaints-To	abuse@stack.nl
NNTP-Posting-Date	Wed, 5 Dec 2012 22:36:50 +0000 (UTC)
User-Agent	slrn/0.9.9p1 (FreeBSD)
Xref	csiph.com comp.lang.c:28961

Show key headers only | View raw

BartC wrote:
) The offsets come from externally generated data, and initially were simple 
) counts: +2, -1 etc. The code looked like this:
)
)  R *p,*q;
)
)  p=q+n;
)
) Very nice. Then I noticed this addition involved internally multiplying n by 
) 16 (or a shift as it was), which wasn't so nice! It was just as easy to 
) generate these numbers as multiples of 16 anyway (+32, -16 etc) so I did 
) that. But then the code wasn't so pretty.

That's quite odd.  A good compiler should have done that optimization for
you, if it's at all possible.  Also, on x86 CPU's, there are addressing
modes that implicitly multiply by factors of two, with no speed penalty.

And, obviously, this is pretty much a micro optimization.  Are you that
concerned with execution speed?  Is this for some embedded cpu?


SaSW, Willem
-- 
Disclaimer: I am in no way responsible for any of the statements
            made in the above text. For all I know I might be
            drugged or something..
            No I'm not paranoid. You all think I'm paranoid, don't you !
#EOT

Thread

Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-02 13:23 +0000
  Re: Casts on lvalues SG <sgesemann@gmail.invalid> - 2012-12-02 14:40 +0100
  Re: Casts on lvalues Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-12-02 13:53 +0000
    Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-06 12:26 +0000
      Re: Casts on lvalues Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-12-06 15:15 +0000
      Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-06 12:05 -0800
  Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-02 12:34 -0800
    Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-02 21:18 +0000
      Re: Casts on lvalues Willem <willem@turtle.stack.nl> - 2012-12-05 22:36 +0000
        Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 23:46 +0000
          Re: Casts on lvalues Willem <willem@turtle.stack.nl> - 2012-12-06 18:35 +0000
    Re: Casts on lvalues pete <pfiland@mindspring.com> - 2012-12-02 16:21 -0500
      Re: Casts on lvalues Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-12-02 17:10 -0500
        Re: Casts on lvalues pete <pfiland@mindspring.com> - 2012-12-02 18:50 -0500
      Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-02 19:14 -0500
  Re: Casts on lvalues falk@rahul.net (Edward A. Falk) - 2012-12-04 23:57 +0000
    Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 01:35 +0000
      Re: Casts on lvalues Piotr Kalinowski <pitkali@gmail.com> - 2012-12-05 16:07 +0100
        Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 16:47 +0000
          Re: Casts on lvalues Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-12-05 13:04 -0500
            Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 18:39 +0000
              Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-05 14:23 -0500
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 22:11 +0000
                Re: Casts on lvalues Ian Collins <ian-news@hotmail.com> - 2012-12-06 11:51 +1300
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 23:58 +0000
                Re: Casts on lvalues Piotr Kalinowski <pitkali@gmail.com> - 2012-12-06 22:00 +0100
                Re: Casts on lvalues glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-06 03:05 +0000
              Re: Casts on lvalues Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-12-05 14:43 -0500
              Re: Casts on lvalues Greg Martin <greg@softsprocket.com> - 2012-12-05 12:25 -0800
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 21:57 +0000
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-05 16:09 -0800
                Re: Casts on lvalues Philipp Thomas <kthomas@linux01.gwdg.de> - 2012-12-07 01:24 +0100
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-06 17:22 -0800
                Re: Casts on lvalues Öö Tiib <ootiib@hot.ee> - 2012-12-07 00:31 -0800
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-07 08:18 -0500
                Re: Casts on lvalues Öö Tiib <ootiib@hot.ee> - 2012-12-07 09:07 -0800
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-07 11:01 -0800
                Re: Casts on lvalues glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-07 21:57 +0000
                Re: Casts on lvalues Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-12-07 22:29 +0000
                Re: Casts on lvalues glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-08 00:04 +0000
                Re: Casts on lvalues lawrence.jones@siemens.com - 2012-12-15 16:51 -0500
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-15 15:48 -0800
                Re: Casts on lvalues lawrence.jones@siemens.com - 2012-12-17 16:37 -0500
                Re: Casts on lvalues Tim Rentsch <txr@alumni.caltech.edu> - 2012-12-17 02:58 -0800
                Re: Casts on lvalues Tim Rentsch <txr@alumni.caltech.edu> - 2012-12-17 02:53 -0800
                Re: Casts on lvalues Tim Rentsch <txr@alumni.caltech.edu> - 2012-12-17 02:43 -0800
              Re: Casts on lvalues Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-12-05 22:07 +0000
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-05 22:20 +0000
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-05 16:10 -0800
                Re: Casts on lvalues Philip Lantz <prl@canterey.us> - 2012-12-06 22:49 -0800
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-07 12:54 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-07 08:22 -0500
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-07 13:48 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-07 11:17 -0500
                Re: Casts on lvalues glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-07 17:33 +0000
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-07 18:28 +0000
                Re: Casts on lvalues glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-07 22:18 +0000
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-07 18:27 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-07 14:14 -0500
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-07 20:16 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-07 15:41 -0500
                Re: Casts on lvalues Tim Rentsch <txr@alumni.caltech.edu> - 2012-12-17 03:03 -0800
              Re: Casts on lvalues Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-12-09 17:54 +0200
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-09 12:38 -0500
                Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-09 18:50 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-09 14:31 -0500
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-09 20:12 -0800
                Re: Casts on lvalues Heikki Kallasjoki <fis+usenet@zem.fi> - 2012-12-10 07:38 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-10 08:12 -0500
                Re: Casts on lvalues Heikki Kallasjoki <fis+usenet@zem.fi> - 2012-12-10 17:46 +0000
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-10 12:59 -0500
                Re: Casts on lvalues Keith Thompson <kst-u@mib.org> - 2012-12-10 12:07 -0800
                Re: Casts on lvalues Tim Rentsch <txr@alumni.caltech.edu> - 2012-12-17 03:11 -0800
                Re: Casts on lvalues Ian Collins <ian-news@hotmail.com> - 2012-12-10 20:50 +1300
                Re: Casts on lvalues James Kuyper <jameskuyper@verizon.net> - 2012-12-10 07:49 -0500
  Re: Casts on lvalues Rui Maciel <rui.maciel@gmail.com> - 2012-12-07 15:19 +0000
    Re: Casts on lvalues "BartC" <bc@freeuk.com> - 2012-12-07 16:54 +0000

csiph-web